I thought both Christo's Gates and Eliasson's Waterfalls were ugly, uninspired and over-hyped. There. I said it. Meanwhile I just stumbled across Tadashi Kawamata's Tree Huts in Madison Sqare Park never having heard of them (or that they had been installed way back in September and are coming down in February) and am in love! Madison Square Park in particular has had a series of great public art including installations by artists Mark Dion and Wim Delvoye. Here's to more great pieces being quietly installed all over the city instead of a few lame blockbusters!
I like looking at this one next to Steichen's The Flatiron (1904):